@Angleterre
Juts bringing your fascinating post over here
As i recall there is quite a bit of tactical game play possible here compared to the US?
e.g in the UK, it might lead to adverse comment at trial, if the defendant does not disclose a material fact relied upon at trial in a pre-trial interview (e.g an alibi)
So you can not disclose - leading probably to "no comment" or then diclose leading to a manufactured version on the spot - that may not match the evidence at trial?
For this reason I also prefer the UK law reforms in this area - sadly in NZ we don't have them.